Reset radio after battery change in 2003 buick century?

To reset the radio in a 2003 Buick Century after changing the battery, first turn on the ignition without starting the engine. Then, press the "Power" button on the radio to turn it on. If the radio prompts for a code, enter the anti-theft code, which is usually found in the owner’s manual or on a card provided with the vehicle. If no code is required, the radio should resume normal functionality.